I sometimes get this strange tightness in my left peck chest muscle. When change positions it goes away..when run do it. Just when at rest. worried heart. Am crazy?

It's understandable to feel concerned about any change in your body, especially if it involves your heart. However, it's important to keep in mind that left pectoral muscle tightness is a common issue and is not necessarily a sign of heart problems. Here are some possible explanations for your symptoms:

1. Muscle Strain:

- Repetitive motions, poor posture, or an injury can strain the pectoral muscles. This can cause tightness, tenderness, and pain in the chest area.

2. Trigger Points:

- Trigger points are tender knots that can form in muscles. When these knots are activated, they can refer pain to other areas, including the chest.

3. Costochondritis:

- This condition involves the inflammation of the cartilage that connects your ribs to your breastbone. Costochondritis can cause sharp, stabbing pain or tightness in the chest.

4. Anxiety:

- Anxiety can cause physical symptoms, such as chest tightness, shortness of breath, and muscle tension.

While tightness in the left chest can sometimes be a sign of a heart condition, it is not the norm and heart problems are often accompanied by other symptoms such as:

- Chest pain or pressure

- Shortness of breath

- Pain that radiates to the left arm, jaw, or neck

- Lightheadedness or dizziness

- Sweating

- Nausea or vomiting

If you are still concerned about your symptoms and they do not improve or are accompanied by any of these additional symptoms, it's always best to consult your healthcare provider for proper evaluation and diagnosis. They can rule out any underlying medical conditions and provide appropriate treatment.